So, considering Mos Eisley is such a wretched hive of scum and villany, Obi-Wan seemed kind of familiar with the place. And something about his ~innocent~ look in the cantina when Han asked if he'd never heard of the Falcon stuck me as him trying to get a raise out of Han. It's because they actually met a couple of years before, and by met I mean hooked up. Maybe Obi-Wan was simply lonely and went in search of some company, or it's an a/b/o thing where he *had* to get laid, I'll leave the details up to the writer.

+ a good time was had by all, and it's a fond memory for both of them
++ there's time for a repeat onboard the Falcon while they're on the way to Alderaan